Function round 

pub fn round<'a, V, E>(
    expr: E,
) -> SQLExpr<'a, V, <E::SQLType as RoundingPolicy<V::DialectMarker>>::Output, E::Nullable, E::Aggregate, E::Sources>
where
    V: SQLParam + 'a,
    E: Expr<'a, V>,
    E::SQLType: RoundingPolicy<V::DialectMarker>,

Rounds to the nearest integer (ROUND(expr)).

The argument must be numeric. The result type comes from RoundingPolicy (REAL on SQLite, float8 on PostgreSQL, the matching integer or decimal type on MySQL) and keeps the argument’s nullability.

Examples

assert_eq!(round(users.score).sql(), r#"ROUND ("users"."score")"#);